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'ro ALL WHoM 1T MAY CONCERN:

.Be it known that I, WILLIAM D. GR-IMSHAW, of Newark, in the county `of Essex, and State of New Jersey, have invented, made, and applied to use a certain new and useful Improvement in Capstans, Snc.; and I do hereby declare the following to be a full, clear, and exact description of the said invention, reference b'einghad to the annexed drawing, making part of this speciiication, wherein- Figure 1 is a vertical section of the said capstan.

Figure 2 is an elevation of the capstan and section of the handspike socket.

Figures 3 to 12 represent the details of the separate partis; as referred to hereafter; and

Figure 13 is the capstan in a horizontal position; and u Figure 14 is a plan of the double lever to actuate the capstan.

The nature of the said invention consists in a friction-brake to control the rotation ofthe capstan, said brake consisting oil a'scrcw that presses the capstan down upon its base, and a spring that raises the same when the screw is slackened. I also provide a peculiarlyfconstructed pawl for giving motion from a handspike socket tothe gearing that rotates the capstan.

In the drawing, a is the metallic base bolted to the deck or timbers receiving the saine, b is the main shaft, see figs. 1 and 3, passing through the base a and bolted to the timbers, asl seen in fig. 1,A in a vertical position, or in g. 13, ina horizontal position. c is the capstan barrel formed with a metal fiange or ring, d, over the base a, and with -the head e, for the handspikes to be introduced as usual. The weight of the capstan is sustained by the spring-f, figs. 1, 3, and 5, so that the ring 0l does not touch upon the vbase a; but in order to produce friction at that point, and so control the revolution of the capstan while a rope or chain is running out, I make use of .the screw-nut g, at the end of shaft b, controlled by a handspike inserted in the pipe-shapedhead h, (see gs. 1, 2, 3, and 4,) or by the hand-whcelseen in fig. 13. When the nut g is screwed down the springf is compressed, andthe surfaces of a and d in contact produce the friction, and when the nut g is slackened the spring f again relieves the friction. This friction `apparatus has a great extent ofsurface, being of Vlarger diameter than-the capstan barrel, and is not liable to be injured in use. Upon the under' side of the capstan barrel is a wheel, c, acted upon by the pinions t' z', that are, mounted upon the shafts Z l, (see figs. 1 and 12,) and the shafts l carry outside the base a the ratchet-wheels n, that are in therforks of the handspike sockets m. These sockets, m, are to be worked back and forth by the levers or handspikes p, (see figs. 1 and 2,)01' they may be worked by a forked or double lever, q, as seen in figs. 13 and 14. The pawls o, introduced in the forks of the handspike sockets m, are formed as shown in gs.- 2, 6, 7, 8, and 10, with the 4heads 1 1, to take the teeth of the ratchet-wheel fn, and with the arms 2 2, by which the pawl may be moved by the foot. 3is the fulcrum-pin of the pawl, and r is a sliding-pointed spring-socket, acting as in figs. 7 and 8, to keep either of the heads, 1, of

'the pawl o, into contact with the teeth of the wheel n, so that the capstan will be rotated in one direction or the other, or when the point of r enters a notch at 4, in the pawl o, it is held in a central position, as seen in fig. 6, so that neither heads 1 is in contact with the wheel n, so that the caps'tan barrel will be free to revolve under the control of the friction. Fig. 11 shows the wheel n, and fig. 9 a side viewfof the handspike socket. This invention, when on a vertical shaft, forms a capstan, andwhen placed upon a horizontal, forms a windlass or winch.'

WhatiI claim, and desire to secure by Letters Patent, isy 1. rl-he combinationV of the shaft b, spring f, nut g, barrel c, and ring d, with the base a, in the manner and for the purpose specified. y

2. I claim the pawl o, constructed in the manner specied, in combination with the pointed spring-socket 1, wheel n, and handspike socket m, as and for the purposes set forth. v

In witness whereof I have hereunto set my signature, this first dayof November, A. D. 1866.

WILLIAM D. GRIMSHAW.

Witnesses:

GEO. D. WALKER, Crus. H. Sirurn. 

